Face Mesh Disappears when I bind it to a Facial Rig
The disappearing of your mesh is actually most probably just a huge difference in scale.
Faceit scales the mesh and armature during binding. Older versions of Faceit applied the scale after binding. This is not happening anymore. By upgrading the Faceit add-on to a more recent version, you should be able to bind again.
By the way: What you are trying to do is binding a mesh that is already bound to an armature to a new armature (the Faceit armature). Faceit will overwrite the weights. You should work on a duplicate, as described here: https://faceit-doc.readthedocs.io/en/latest/workaround/